Packard script on the cam covers?

The new button is a nice addition. Thanks.

An easier solution would be to install a non-boosted dual master cylinder. Pedal and linkage parts from a non-power brake Packard are available. Mounting the master cylinder will require some thought and work, but doable. I had the Easamatic power brake system removed from my 1955 Super Clipper (no torsion level and similar to your 1953 Patrician) and replaced with a conventional single cylinder master cylinder. All parts were from an earlier Packard. The brakes worked remarkably well, they were well modulated and easy pedal action. Ross Miller did the conversion. This should be a more than satisfactory change even with disc brakes on the front. Of course, you will need a proportioning valve so as to have good brake balance between the front and rear brakes.

My guess - a sticking fast idle cam/linkage on the carburetor.

Goops, BIG mistake. GL1 for trans and od and GL4 for differential. Thanks for catching this error.

85W-140 GL1 not 85W-40 GL1. Surprised no one caught my typo.

Many of us use 85W-40 GL1 EP gear oil in the differential. It must be extreme pressure rated gear oil.

Carrozzeria Miller.

Talk with Bill at Diamondback Tires. Their Auburn Deluxe Tubeless Radials are made in the vintage sizes. I have found him to be most helpful.

Kev, aluminum foil is a good masking to use for protecting parts which you do not want to paint.